[GC] Use cfp-reftest pass #7905
Merged
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This pass has been used by j2wasm for a while, and is useful there, so
enable it for general use.
This pass can grow code size in some cases, if it emits a
ref.test
that is notlater optimized out. For that reason only enable it in
-O3+
, that is, whenoptimizing aggressively for size.
Also fuzz this pass more.